Methods for Dispensing Hydrogen Gas

ABSTRACT

In one embodiment, the method of dispensing hydrogen gas comprises: selecting a hydrogen gas pressure using a pressure selector disposed in operable communication with a hydrogen gas output port, dispensing hydrogen gas at the selected hydrogen gas pressure, ceasing a flow of hydrogen gas to the vessel, and removing the nozzle from fluid communication with the vessel. The nozzle is in fluid communication with a hose and the hydrogen gas output port to form a first outlet disposed in mechanical connection with a mobile platform. In yet another embodiment, the method of dispensing hydrogen gas comprises: producing the hydrogen gas in an electrolysis cell system, activating a hydrogen dispenser, dispensing the hydrogen gas to a vessel, and ceasing a flow of the hydrogen gas to the vessel. The hydrogen dispenser and the electrolysis cell system are on a mobile platform.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patentapplication Ser. No. 10/248,480 filed Jan. 22, 2003, which claimspriority to U.S. Provisional Patent Application No. 60/319,086 filedJan. 22, 2002, both of which are incorporated herein by reference intheir entirety.

BACKGROUND

This disclosure relates to electrochemical cells, and, moreparticularly, to a dispensing apparatus for an electrolysis cell.

Electrochemical cells are energy conversion devices, usually classifiedas either electrolysis cells or fuel cells. Proton exchange membraneelectrolysis cells can function as hydrogen generators byelectrolytically decomposing water to produce hydrogen and oxygen gases.Referring to FIG. 1, a section of an anode feed electrolysis cell of theprior art is shown generally at 10 and is hereinafter referred to as“cell 10.” Reactant water 12 is fed into cell 10 at an oxygen electrode(anode) 14 to form oxygen gas 16, electrons, and hydrogen ions (protons)15. The chemical reaction is facilitated by the positive terminal of apower source 18 connected to anode 14 and the negative terminal of powersource 18 connected to a hydrogen electrode (cathode) 20. Oxygen gas 16and a first portion 22 of water are discharged from cell 10, while theprotons 15 and second portion 24 of the water migrate across a protonexchange membrane 26 to cathode 20. At cathode 20, hydrogen gas 28 isformed and removed, generally through a gas delivery line. Secondportion 24 of water, which is entrained with hydrogen gas, is alsoremoved from cathode 20.

An electrolysis cell system may include a number of individual cellsarranged in a stack with reactant water being directed through the cellsvia input and output conduits formed within the stack structure. Thecells within the stack are sequentially arranged, and each one includesa membrane electrode assembly defined by a proton exchange membranedisposed between a cathode and an anode. The cathode, anode, or both maybe gas diffusion electrodes that facilitate gas diffusion to protonexchange membrane. Each membrane electrode assembly is in fluidcommunication with a flow field positioned adjacent to the membraneelectrode assembly. The flow fields are defined by structures thatfacilitate fluid movement and membrane hydration within each individualcell.

The second portion of water, which is entrained with hydrogen gas, isdischarged from the cathode side of the cell and is fed to a phaseseparation unit to separate the hydrogen gas from the water, therebyincreasing the hydrogen gas yield and the overall efficiency of the cellin general. The removed hydrogen gas may be delivered directly to ahydrogen powered application for use as a fuel. Alternately, the removedhydrogen gas may be charged to a storage facility, e.g., a cylinder, atank, or a similar type of containment vessel, for subsequent deliveryto a hydrogen powered application.

Regardless of whether the hydrogen gas is delivered directly to theapplication or delivered from a storage facility, the gas is dispensedthrough a dispensing system. Oftentimes, however, the application towhich the gas is dispensed is remote from the dispensing system, and thesystem lends itself to being stationary. While hydrogen poweredautomobiles may be brought to the dispensing system with littledifficulty, larger and less easily movable applications (e.g., heavymachinery) may be impossible to move.

While existing electrolysis cell systems are suitable for their intendedpurposes, there still remains a need for improvements, particularlyregarding the efficient dispensing of hydrogen gas to a hydrogen poweredapplication to complete a refueling operation. Therefore, a need existsfor a dispensing system that is capable of being moved to the particularapplication and effectively delivering the hydrogen gas generated by thecell system to the application.

SUMMARY

Disclosed herein are methods of dispensing hydrogen gas. In oneembodiment, the method of dispensing hydrogen gas comprises: selecting ahydrogen gas pressure using a pressure selector disposed in operablecommunication with a hydrogen gas output port, disposing a nozzle influid communication with a vessel to receive the hydrogen gas,dispensing hydrogen gas at the selected hydrogen gas pressure, ceasing aflow of hydrogen gas to the vessel, and removing the nozzle from fluidcommunication with the vessel. The nozzle is in fluid communication witha hose and the hydrogen gas output port to form a first outlet disposedin mechanical connection with a mobile platform.

In another embodiment, the method of dispensing hydrogen gas comprises:disposing a first nozzle of a first outlet in fluid communication with avessel to receive the hydrogen gas, dispensing the hydrogen gas, ceasinga flow of the hydrogen gas to the vessel, and removing the nozzle fromfluid communication with the vessel. The first outlet comprises thefirst nozzle in fluid communication with a first hydrogen output port,wherein the first hydrogen output port is in operable communication witha first display panel, and wherein the first nozzle, the first hydrogenoutput port, the hydrogen gas, and the first display panel, are on amobile platform.

In yet another embodiment, the method of dispensing hydrogen gascomprises: producing the hydrogen gas in an electrolysis cell system,activating a hydrogen dispenser, dispensing the hydrogen gas to avessel, and ceasing a flow of the hydrogen gas to the vessel. Thehydrogen dispenser and the electrolysis cell system are on a mobileplatform.

The above described and other features are exemplified by the detaileddescription and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Referring now to the Figures, which are exemplary embodiments, andwherein the like elements are numbered alike:

FIG. 1 is a schematic representation of an anode feed electrolysis cellof the prior art;

FIG. 2 is a schematic representation of an electrolysis cell system inwhich hydrogen gas can be generated;

FIG. 3 is a schematic representation of a hydrogen dispensing apparatus;

FIG. 4 is a perspective view of a hydrogen dispensing apparatus mountedon a truck bed; and

FIGS. 5A and 5B are rear sectional views of a truck bed having ahydrogen dispensing apparatus disposed at bed level and at ground level.

DETAILED DESCRIPTION

The terms “first, second, third,” etc. used herein are merely intendedto distinguish between elements of the system and are not intended todenote any ordering or sequence.

Referring to FIG. 2, an exemplary embodiment of a hydrogen gas source isan electrolysis cell system, which is shown generally at 30 and ishereinafter referred to as “system 30.” System 30 may be generallysuitable for generating hydrogen for use in gas chromatography, as afuel, and for various other applications. While the inventiveimprovements described below are described in relation to anelectrolysis cell, the improvements are applicable to both electrolysisand fuel cells. Furthermore, although the description and figures aredirected to the production of hydrogen and oxygen gas by theelectrolysis of water, the apparatus is applicable to the generation ofother gases from other reactant materials.

System 30 includes a water-fed electrolysis cell capable of generatinghydrogen gas from reactant water. The reactant water utilized by system30 is stored in a water source 32 and is fed by gravity or pumpedthrough a pump 38 into an electrolysis cell stack 40. The supply linepreferably includes an electrical conductivity sensor 34 disposedtherewithin to monitor the electrical potential of the water, therebydetermining its purity and ensuring its adequacy for use in system 30.

Cell stack 40 comprises a plurality of cells, e.g., similar to cell 10described above with reference to FIG. 1, that are encapsulated withinsealed structures (not shown). The reactant water is received bymanifolds or other types of conduits (not shown) that are in fluidcommunication with the cell components. An electrical source 42 isdisposed in electrical communication with each cell within cell stack 40to provide a driving force for the dissociation of the water. Electricalsource 42 is operatively communicable with a cell control system (notshown) that controls the operation of system 30.

Oxygen and water exit cell stack 40 via a common stream that recyclesthe oxygen and water to water source 32 where the oxygen is vented tothe atmosphere. The hydrogen stream, which is entrained with water,exits cell stack 40 and is fed to a gas/liquid separator or phaseseparation tank, which is a hydrogen/water separation apparatus 44,hereinafter referred to as “separator 44,” where the gas and liquidphases are separated. The exiting hydrogen gas (having a lower watercontent than the hydrogen stream to separator 44) can be further driedat a drying unit 46, which may be, for example, a diffuser, a pressureswing absorber, desiccant, or the like. This wet hydrogen stream canhave a pressure of about 1 pounds per square inch (psi) up to andexceeding about 20,000 psi. Preferably the hydrogen stream pressure isabout 1 psi to about 10,000 psi with a pressure of about 1,500 psi toabout 2,500 psi more preferred for some applications, and a pressure ofabout 100 psi to about 275 psi more preferred for other applications.

Water with trace amounts of entrained hydrogen is returned to watersource 32 from separator 44 through an optional low-pressure hydrogenseparator 48. Low pressure hydrogen separator 48 allows hydrogen toescape from the water stream due to the reduced pressure, and alsorecycles water to water source 32 at a lower pressure than the waterexiting separator 44. Separator 44 also includes a release 50, which maybe a relief valve, to rapidly purge hydrogen to a hydrogen vent 52 whenthe pressure or pressure differential exceeds a pre-selected limit.

Pure hydrogen from drying unit 46 is fed to a refueling system 70disposed in fluid communication with cell stack. Refueling system 70 isa fluid distribution system that allows for the transfer of hydrogen gasproduced by system 30 to the application site. Refueling system 70 maybe remotely located with respect to system 30, or it may be disposeddirectly at system 30. A dispensing apparatus (shown below withreference to FIGS. 3 through 5) is maintained in fluid communicationwith refueling system 70 to deliver the hydrogen gas to the application.

A hydrogen output sensor 64 can be incorporated into system 30 tomonitor the hydrogen pressure. Hydrogen output sensor 64 can be anysuitable output sensor including, but not limited to, a flow ratesensor, a mass flow sensor, or any other quantitative sensing devicesuch as a pressure transducer that converts the gas pressure within thehydrogen line to a voltage or current value for measurement. Hydrogenoutput sensor 64 is interfaced with a transmitter 66, which is capableof converting the voltage or current value into a pressure reading. Adisplay (not shown) may be disposed in operable communication withtransmitter 66 to provide a reading of the pressure, for example, at thelocation of hydrogen output sensor 64 on the hydrogen line. Transmitter66 is any suitable converting device, such as an analog circuit, adigital microprocessor, or the like, capable of converting a sensorsignal into a displayable value.

As stated above, the dispensing apparatus is disposed in fluidcommunication with the electrolysis cell system through refueling system70. The electrolysis cell system, refueling system 70, and thedispensing apparatus are mounted so as to be mobile, thereby enablingthe hydrogen source to be brought to the particular hydrogen-poweredapplication. Referring now to FIG. 3, one exemplary embodiment of adispensing apparatus is shown schematically at 78. Dispensing apparatus78 includes a first outlet 90 and a second outlet 92 both disposed influid communication with refueling system 70 through an inlet line 134.Inlet line 134 extending from refueling system 70 can include a filter135, a pressure control valve 136 to regulate the flow of hydrogen gasfrom refueling system 70, an actuatable valve 137 responsive to eitheroperator input or sensed system parameters (e.g., upstream pressures,flow rates, and the like) to allow fluid communication between refuelingsystem 70 and outlets 90, 92, and a flow meter 138 to monitor the flowto outlets 90, 92. Inlet line 134 may further be flexible in order toallow outlets 90, 92 to be moved relative to refueling system 70. Agrounding device (e.g., a rod, line, or the like) 140 can be disposed inmechanical and, when in operation, electrical communication with inletline 134 and is preferably inserted into the ground at a depthsufficient to enable an electrical ground (e.g., a distance of abouteight feet or so). A hydrogen vent 86 is disposed in fluid communicationwith each outlet 90, 92 to enable excess pressure within the system tobe vented to the atmosphere.

Each outlet 90, 92 is defined by a line 142 that can include anactuatable valve 143 controllable in response to sensed systemparameters. Each line 142 preferably includes an upper product outputport 150 and a lower product output port 152 from which hydrogen gas maybe dispensed. Upper nozzle assemblies 154 are attached to each upperproduct output port 150. Lower nozzle assemblies are similarly attachedto each lower product output port 152. Each nozzle assembly preferablycomprises a breakaway coupling 144 disposed at its respective outputport, a flexible hose 156 depending from breakaway coupling 144, and anozzle 158 disposed at flexible hose 156. Breakaway couplings 144 arereadily separable from their associated product outlet ports 150, 152 inthe event that a predetermined amount of force is applied at theassociated nozzle assembly 154.

First outlet 90 delivers hydrogen gas at a first pressure through itsassociated product outlet ports 150, 152, and second outlet 92 delivershydrogen gas at a second pressure through its associated product outletports 150, 152. The differing pressures at which outlets 90, 92 deliverhydrogen gas are generally suited for hydrogen-powered automobileapplications. Other applications for which the hydrogen gas may be usedinclude, but are not limited to, heavy machinery, aircraft, and marineapplications. First outlet 90 is preferably suited to deliver hydrogengas at pressures of less than or equal to about 4,500 psi (e.g., atpressures of about 2,700 psi to about 4,500 psi, and more preferably atabout 3,600 psi). Second outlet 92 is preferably suited to deliverhydrogen gas at pressures exceeding about 3,500 psi, e.g., at about3,700 psi to about 6,750 psi, and more preferably at about 4,600 psi toabout 6,750 psi, with about 5,000 psi more preferred. Outlets 90, 92 areconfigured such that they can simultaneously deliver hydrogen gas, e.g.,to two vehicles, tanks, or the like. Further, one or more of the outletscan optimally comprise a pressure selector such that an operator (e.g.,person, computer, or other controller) can select a desired pressure fordispensing the hydrogen gas. For example, one operator can select apressure of 3,750 psi and dispense hydrogen gas to fill a tank to apressure of 3,750 psi, while a subsequent operator can select a pressureof 5,000 psi, at the same outlet, and dispense hydrogen gas to fill avessel to a pressure of 5,000 psi. The limits upon the pressures towhich a vessel can be filled from the mobile dispenser are merely basedupon equipment specifications. Filling of vessels to pressures of up toand exceeding about 20,000 psi are envisioned.

Referring now to FIG. 4, one exemplary embodiment of a vehicle by whichdispensing apparatus 78 can be made mobile is shown at 80. Vehicle 80comprises a platform 82 on which dispensing apparatus 78 and,optionally, the refueling system are mounted. Platform 82 may be a truckbed or other type of wheeled structure, as is shown, or any type ofcarriage mechanism including, but not limited to, tracked platforms,railed platforms, floating platforms, and the like, as well ascombinations comprising at least one of the foregoing mechanisms.Dispensing apparatus 78 is preferably positioned between opposing endsof platform 82 such that wheels 84 positioned at each end sufficientlysupport the weight of dispensing apparatus 78. Outlets 90, 92 aregenerally positioned adjacent to each other and side-by-side on platform82.

Flexible hoses disposed at lower product output ports 152, shown at 157,are generally of lengths such that their associated nozzles can beaccessed by an operator standing at ground level when dispensingapparatus 78 is positioned at platform 82. Flexible hoses 156 dependingfrom upper product output ports 150 are substantially shorter, therebyrendering their associated nozzles 158 virtually inaccessible by anoperator standing at ground level. Short hoses are preferred to minimizecomplexity of the apparatus and to avoid possible hose damage due tohitting the ground. Optionally, the outlets 90 and/or 92 can comprise amovable panel (e.g., sliding, flipping, and the like, e.g., verticallyactuatable) and/or the outlets themselves can be on a movable portion ofthe dispensing apparatus 78 that enables the height of the nozzle and/orcontrols to be adjusted. The height can thereby be adjusted for facileoperator accessibility. As stated above, although the hydrogen gasdispensed from first outlet 90 is preferably at about 3,600 psi and thehydrogen gas dispensed from second outlet 92 is preferably at about5,000 psi in accordance with current hydrogen use standards, otherpressures can be attained by adjusting the pressure of the storagevessels and/or via the use of various pressure adjusting (increasingand/or decreasing) devices (such as compressors, and the like). Forexample, the nozzles can be designed to dispense gas at a range ofpressures based upon operator input, a sensed signal, or the like.

Interface units 104 are disposed at the front face of each outlet 90, 92such that the dispensing of hydrogen gas can be monitored and/orcontrolled by the operator. Interface units 104 are positioned at thefront face of each outlet 90, 92, such that monitoring and/or control iseasily facilitated. In particular, interface units 104 may includemeters that supply the operator with information pertaining to thevolumes of hydrogen gas dispensed. Interface units 104 may also includetransactional apparatuses, e.g., card-swiping apparatuses that enablethe operator to pay for hydrogen gas to be dispensed, and displayscreens that supply the operator with information pertaining to thespecific transaction.

Dispensing apparatus 90, 92 may be mounted at platform 82 such that anoperator at ground level can access upper nozzle assemblies 156. To makethe upper nozzle assemblies accessible, dispensing apparatus 78 may belowered. Each half of dispensing apparatus 78 (i.e., first outlet 90and/or second outlet 92) may, furthermore, be lowered independently ofthe other, or both may be lowered together. Lowering of dispensingapparatus 78 as a unit or either outlet 90, 92 may be affected via acounterweight assembly, shown at 108 with reference to FIGS. 5A and 5B,or the like.

Counterweight assembly 108 includes a counterweight 110 disposed inmechanical communication with apparatus 78 through a pulley/cablearrangement 112. Pulley/cable arrangement 112 may include anyarrangement of pulleys 114 (e.g., block and tackle arrangements) thatenable dispensing apparatus 78 (or either outlet individually) to belowered and raised by an operator, manually or automatically.Counterweight 110 is preferably mounted on a track assembly (not shown)that allows counterweight 110 to translate vertically withoutsignificant sway in horizontal directions. The outlets are likewisemounted on similar track assemblies (not shown).

As can be seen in FIG. 5A, upon articulation of dispensing apparatus 78in the direction indicated by an arrow 116, counterweight 110 translatesin the direction indicated by an arrow 118. Once dispensing apparatus 78is lowered, counterweight 110 is disposed proximate an upper end of thetrack on which it slides, as can be seen in FIG. 5B. Automatic brakingmechanisms (not shown) retain dispensing apparatus 78 at ground leveland counterweight 110 at the elevated level until the operatorarticulates dispensing apparatus 78 in the direction of an arrow 120,thereby causing counterweight 110 to translate in the direction of anarrow 122.

In operation, an operator (e.g., a consumer) activates the dispenser(e.g., by swiping a card, removing the nozzle from the nozzle holder,entering a code, and/or pushing a button, or the like). An electricalconnection is optionally made to the unit to be fueled (e.g., a vehicle,tank, or the like), and the appropriate dispensing nozzle is disposed influid communication with the vessel to be fueled (e.g., a lever is usedto mechanically engage the connector to a fill tube with similarrating). Optionally the operator may make a pressure selection on thedispensing unit to define the pressure fill desired. Various sensors(e.g., pressure, temperature, and the like) within the system monitorand/or control the fueling process to ensure the fueling meets theappropriate codes and standards. When the criteria for initiation offueling have been met (e.g., the sensors signal ready), the appropriatemethodology of filling initiates (e.g., fast or slow filling to thedesired pressure). Hydrogen is delivered to the tank by positivepressure differential between the dispenser and the tank. Filling willcontinue until a pre-set pressure level is achieved, or until one ofseveral other thresholds has been triggered (e.g., maximum selectedtemperature reached, preset mass transfer has occurred, maximum dollaramount of hydrogen has been reached, or another sensor signal initiatesa halt in the filling process). The operator will then disengage theapplicable connections (e.g., mechanical and/or electrical connections)and return the nozzle to the dispenser.

The hydrogen dispensing apparatus described herein can be employed inconjunction with any type of electrochemical cell system (e.g., it canreceive hydrogen from an electrolysis cell system that is in fluidcommunication with the dispensing apparatus 78 and co-located on thevehicle 80 or located remotely). The hydrogen from the dispensingapparatus can be employed to fuel any hydrogen consuming device, e.g.,fuel cells (such as proton exchange membrane fuel cells, solid oxidefuel cells (SOFC), phosphoric acid fuel cells (PAFC), and the like)employed in various applications including vehicles,residential/commercial power supply units (primary and back-up, and thelike).

Mobility of the apparatus provides additional advantages over stationaryhydrogen dispensing systems, inasmuch as the mounting of the hydrogendispensing apparatus to a movable platform renders the apparatus capableof being easily moved to accommodate the demands of substantiallystationary hydrogen applications. Some possible stationary applicationsrange from construction sites, buildings, and the like, to mobilevehicle fueling stations (e.g., a mobile hydrogen dispensing unit can belocated at a fueling station and, when the amount of stored hydrogendecreases below a selected level, the dispensing unit can be replacedwith another mobile hydrogen dispensing unit). Alternatively, since thehydrogen dispensing apparatus is designed to allow connection to anauxiliary storage unit (e.g., a tube trailer), when the auxiliarystorage is depleted, it can be replaced with a different auxiliarystorage unit that contains hydrogen. In yet another alternativeembodiment, the auxiliary storage unit might be filled by the dispensingapparatus. The full auxiliary storage unit might be delivered to acustomer and replaced with a depleted auxiliary storage unit forsubsequent filling.

The dispensing apparatus can alternatively comprise: a first outletconfigured to dispense said hydrogen gas at a first pressure; and asecond outlet configured to dispense said hydrogen gas at a secondpressure, said second outlet being in fluid communication with saidfirst outlet through an inlet line, said inlet line being disposed influid communication with a hydrogen source. Optionally, the first outletand said second outlet can each comprise, a line, a first product outputport disposed in fluid communication with the line, a second productoutput port disposed in fluid communication with said line, a firstnozzle assembly disposed in fluid communication with said first productoutput port, and a second nozzle assembly disposed in fluidcommunication with said second product output port. The first nozzleassembly and the second nozzle assembly can each optionally comprise, abreakaway coupling, a flexible hose disposed in operable communicationwith said breakaway coupling, and a nozzle disposed in operablecommunication with said flexible hose. Additionally, the dispensingapparatus can further comprise a grounding device disposed in electricalcommunication with said inlet line, a wheeled structure, wherein saiddispensing apparatus is mounted on said wheeled structure, an interfaceunit disposed proximate said first outlet, or a counterweight/pulleyassembly to affect the translation of said dispensing apparatus in avertical direction, as well as combinations comprising at least one ofthe foregoing additional features.

One method for dispensing hydrogen gas can comprise: activating thehydrogen dispenser, wherein said dispenser comprises an inlet line influid communication with a hydrogen source, said inlet line optionallycomprising a filter, a pressure control valve, an actuatable valve,and/or a flow meter; a first outlet disposed in fluid communication withsaid inlet line, said first outlet comprising an actuatable valve, afirst product output port, a second product output port, a firstbreakaway coupling disposed at each of said output ports, a firstflexible hose disposed at each of said first breakaway couplings, and afirst nozzle disposed at each of said flexible hoses; a second outletdisposed in fluid communication with said inlet line, said second outletcomprising an actuatable valve, a third product output port, a fourthproduct output port, a second breakaway coupling disposed at each ofsaid output ports, a second flexible hose disposed at each of saidbreakaway couplings, and a second nozzle disposed at each of saidflexible hoses; an electrical grounding device disposed in mechanicalcommunication with said inlet line; and a mobile platform, wherein saiddispensing apparatus is supported on said mobile platform; mechanicallyconnecting at least one of said first nozzles or said second nozzles toa hydrogen unit; dispensing hydrogen to said hydrogen unit; and ceasinghydrogen flow to said hydrogen unit. Optionally, as the hydrogen isdispensed (either at the storage vessel (cylinder, or the like) or asthe hydrogen enters the outlet line(s)), it can be cooled. Preferablythe hydrogen is cooled to non-cryogenic temperatures.

While the disclosure has been described with reference to a preferredembodiment, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the disclosure. Inaddition, many modifications may be made to adapt a particular situationor material to the teachings of the disclosure without departing fromthe essential scope thereof. Therefore, it is intended that thedisclosure not be limited to the particular embodiment disclosed as thebest mode contemplated for carrying out this disclosure, but that thedisclosure will include all embodiments falling within the scope of theappended claims.

1. A method of dispensing hydrogen gas, comprising: selecting a hydrogengas pressure using a pressure selector disposed in operablecommunication with a hydrogen gas output port; disposing a nozzle influid communication with a vessel to receive the hydrogen gas;dispensing hydrogen gas at the selected hydrogen gas pressure; ceasing aflow of hydrogen gas to the vessel; and removing the nozzle from fluidcommunication with the vessel; wherein the nozzle is in fluidcommunication with a hose and the hydrogen gas output port to form afirst outlet disposed in mechanical connection with a mobile platform.2. The method of claim 1, further comprising vertically actuating thefirst outlet.
 3. The method of claim 1, wherein the selected pressure isabout 2,700 psi to about 4,500 psi.
 4. The method of claim 1, whereinthe selected pressure is about 3,700 psi to about 6,750 psi.
 5. Themethod of claim 1, wherein the first outlet further comprises a valve,and further comprising actuating the valve.
 6. The method of claim 1,further comprising adjusting a hydrogen gas fill pressure to theselected pressure.
 7. A method of dispensing hydrogen gas, comprising:disposing a first nozzle of a first outlet in fluid communication with avessel to receive the hydrogen gas, wherein the first outlet comprisesthe first nozzle in fluid communication with a first hydrogen outputport, wherein the first hydrogen output port is in operablecommunication with a first display panel, and wherein the first nozzle,the first hydrogen output port, the hydrogen gas, and the first displaypanel, are on a mobile platform; dispensing the hydrogen gas; ceasing aflow of the hydrogen gas to the vessel; and removing the nozzle fromfluid communication with the vessel.
 8. The method of claim 7, furthercomprising dispensing additional hydrogen gas from with a second outlet,and wherein the first outlet and the second outlet are dispensinghydrogen gas at different fill pressures.
 9. The method of claim 8,wherein a first outlet pressure is about 2,700 psi to about 4,500 psi,and wherein a second outlet pressure is about 3,700 psi to about 6,750psi.
 10. The method of claim 7, further comprising vertically actuatingthe first outlet.
 11. A method of dispensing hydrogen gas, comprising:producing the hydrogen gas in an electrolysis cell system; activating ahydrogen dispenser; dispensing the hydrogen gas to a vessel; and ceasinga flow of the hydrogen gas to the vessel; wherein the hydrogen dispenserand the electrolysis cell system are on a mobile platform.
 12. Themethod of claim 11, wherein the hydrogen gas is dispensed with a firstoutlet, and further comprising dispensing additional hydrogen gas with asecond outlet, and wherein the first outlet and the second outlet aredispensing hydrogen gas at different fill pressures.
 13. The method ofclaim 12, wherein a first outlet pressure is about 2,700 psi to about4,500 psi, and wherein a second outlet pressure is about 3,700 psi toabout 6,750 psi.
 14. The method of claim 11, wherein activating thehydrogen dispenser further comprises vertically actuating a firstoutlet.
 15. The method of claim 11, wherein activating the hydrogendispenser further comprises selecting a hydrogen gas pressure using apressure selector disposed in operable communication with a hydrogen gasoutput port.
 16. The method of claim 11, wherein producing the hydrogenfurther comprises introducing water to the electrolysis cell system.